Dynamics of the superconducting condensate in the presence of a magnetic field. Channelling of vortices in superconducting strips at high currents

D. Vodolazov; B. J. Baelus; F. M. Peeters

doi:10.1016/j.physc.2003.10.027

paper

Dynamics of the superconducting condensate in the presence of a magnetic field. Channelling of vortices in superconducting strips at high currents

arXiv:cond-mat/0310438 · doi:10.1016/j.physc.2003.10.027

Abstract

On the basis of the time-dependent Ginzburg-Landau equation we studied the dynamics of the superconducting condensate in a wide two-dimensional sample in the presence of a perpendicular magnetic field and applied current. We could identify two critical currents: the current at which the pure superconducting state becomes unstable ( $J_{c 2}$ \cite{self1}) and the current at which the system transits from the resistive state to the superconducting state ( $J_{c 1} < J_{c 2}$ ). The current $J_{c 2}$ decreases monotonically with external magnetic field, while $J_{c 1}$ exhibits a maximum at $H^{*}$ . For sufficient large magnetic fields the hysteresis disappears and $J_{c 1} = J_{c 2} = J_{c}$ . In this high magnetic field region and for currents close to $J_{c}$ the voltage appears as a result of the motion of separate vortices. With increasing current the moving vortices form 'channels' with suppressed order parameter along which the vortices can move very fast. This leads to a sharp increase of the voltage. These 'channels' resemble in some respect the phase slip lines which occur at zero magnetic field.

arXiv comment5 pages, 4 figures, Proceedings of Third European Conference on Vortex Matter in Superconductors

Dynamics of the superconducting condensate in the presence of a magnetic field. Channelling of vortices in superconducting strips at high currents

Abstract

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